The interface at the brodgar.io link is very badly arranged.
I'd like to see, separately, what I can sell at a market to acquire its currency, and then what I can buy with that currency. I'd like to be able to restrict the search to one market at a time, particularly if they don't use the same currency. (Instead, scrolling down takes me from market to market.) I'd like to be able to search for a particular item as price separately from searching for it as product. (That way I could search for a market currency, as product, and determine what I could sell you....)
I much prefer the google doc provided by Blackspire Citadel. It's not perfect, but it separates what is bought from what is sold, and doesn't e.g. leave me guessing the conversion from smaller to larger currency. (All its prices are expressed in terms of their lowest value coin.)
Perhaps the advantage of brodgar.io is that the information is automated, and thus up to date. Less work for the vendors, and more accuracy for the customers.
That's great, but not if I can't figure out what you are willing to buy from me, fast and conveniently. It doesn't matter to me what you sell, if I can't acquire your currency, or can't acquire it in reasonable quantities. (Also, If it is going to take me 50 trips to acquire currency for one purchase, it's not happening

)